Mitsubishi Electric FR-F820-04750 Instruction Manual page 735

Protective functions
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
FR-F800
SA
Safety stop
Appears when safety stop function is activated (during output shutoff ). (Refer to page 2-60.)
Check if an emergency stop device is activated.
Check if the shorting wire between S1 and PC or between S2 and PC is disconnected when
not using the safety stop function.
An emergency stop device is active when using the safety stop function. Identify the cause
of emergency stop, ensure the safety and restart the system.
When not using the safety stop function, short across terminals S1 and PC and across S2 and
PC with shorting wire for the inverter to run.
If "SA" is indicated when wires across S1 and SIC and across S2 and SIC are both conducted
while using the safety stop function (drive enabled), internal failure might be the cause.
Check the wiring of terminals S1, S2 and SIC and contact your sales representative if the
wiring has no fault.
MT1 to MT3
Maintenance signal output 1 to 3
Appears when the inverter's cumulative energization time reaches or exceeds the parameter set
value. Set the time until the MT is displayed using Pr. 504 "Maintenance timer 1 warning output
set time" (MT1), Pr. 687 "Maintenance timer 2 warning output set time" (MT2), and Pr. 689
"Maintenance timer 3 warning output set time" (MT3).
MT does not appear when the settings of Pr. 504, Pr. 687, and Pr. 689 are initial values (9999).
The set time of maintenance timer has been exceeded. (Refer to page 5-92.)
Take appropriate countermeasures according to the purpose of the maintenance timer setting.
Setting "0" in Pr. 503 "Maintenance timer 1", Pr. 686 "Maintenance timer 2", and Pr. 688
"Maintenance timer 3" clears the indication.
UF
USB host error
Appears when an excessive current flows into the USB A connector.
Check if a USB device other than a USB memory device is connected to the USB A connector.
If a device other than a USB memory device is connected to the USB A connector, remove
the device.
Setting Pr. 1049 "USB host reset "= "1" or inverter reset clears the UF indication.
EV
24 V external power supply operation
Flickers when the main circuit power supply is off and the 24 V external power supply is being
input.
Power is supplied from a 24 V external power supply.
Turning ON the power supply (main circuit) of the inverter clears the indication.
If the indication is still displayed after turning ON of the power supply (main circuit) of the
inverter, the power supply voltage may be low, or the jumper between the terminals P/+
and P1 may be disconnected.
Causes and corrective actions
FR-LU08
to
FR-LU08
FR-LU08
FR-LU08
—
MT1 to MT3
UF
—
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